Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd69ddc184180f2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 13:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ab343bfa4e66c8c0406f9441cc3db17 SHA-1: f9c7e1011f3af6d34aacee1f9907feb8464d3dda SHA-256: 9bd69ddc184180f2fa94bb541124ff290a73b227621c6f2fbc64e1d849f34277
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=rupaul%27s+drag+race+uk+season+2+episode+2+watch+online PDF link annotation
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/50806439059.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/43022351128.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/sejavowo.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/xinatarabagube.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/88321827813.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/13492650731.pdfIn PDF document text
    • http://torgoborud.org/images/file/wubetekagi.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/83190404880.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090607512728.pdfIn PDF document text
    • https://virker-ikke.dk/files/98946732885.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lic22kbs4u6v50gac0hh4vbeub/12457493298.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd56b2d42b---vilarulatominotolovilo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d8c4565a---pupelexunibo.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/98513308852.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/muduripejudedeno.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/rexisefipoma.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/5965650876.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/kudavodapokerus.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/natiloluz.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/mapabaveg.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8nvf7e8esc3lu46au4tgobffe4/pobiweza.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/91764064624.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/miburugojefirad.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/60127096414.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADA 17064 bytes
SHA-256: 052e12c7ff1568f5ad19576faeaf306c2336f84f3b13533a796d0f7d98be7811
font_01_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 11272 bytes
SHA-256: dc7ddff504c53fd8cbfd89cf0daa88860a5a831473d94bb47aa13f4a6daa2041

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